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Message-Id: <1401572260-18973-1-git-send-email-manuel.schoelling@gmx.de> Date: Sat, 31 May 2014 23:37:40 +0200 From: Manuel Schölling <manuel.schoelling@....de> To: davem@...emloft.net Cc: jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Manuel Schölling <manuel.schoelling@....de> Subject: [PATCH v2] dns_resolver: Do not accept domain names longer than 255 chars According to RFC1035 "[...] the total length of a domain name (i.e., label octets and label length octets) is restricted to 255 octets or less." Signed-off-by: Manuel Schölling <manuel.schoelling@....de> --- net/dns_resolver/dns_query.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c index e7b6d53..5b49958 100644 --- a/net/dns_resolver/dns_query.c +++ b/net/dns_resolver/dns_query.c @@ -93,8 +93,8 @@ int dns_query(const char *type, const char *name, size_t namelen, } if (!namelen) - namelen = strlen(name); - if (namelen < 3) + namelen = strnlen(name, 256); + if (namelen < 3 || namelen > 255) return -EINVAL; desclen += namelen + 1; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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